This question about Using an extension: Answered
ScaleOnDirectedGraphPINotWorking
I wanted, without success, to limit the size of the rendered graphs on DirectedGraphPlugin so I introduced <dot enginer="dot" size="200x300"> for such purpose. The PI is anabled and admin´s {Plugins}{DirectedGraphPlugin}{magicPath} is /usr/bin (I verified that imagemagick´s convert is there)
What is missing
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AntonioVega - 13 Aug 2011
The size= parameter is used only when anti-aliasing is enabled. In most modern installations of graphviz, anti-aliasing isn't used or needed, so no conversion is made and the size= parameter is not used. In this case the way to control the size is in the dot language itself.
See
http://www.graphviz.org/pdf/dotguide.pdf - for example
digraph G {
size ="4,4";
...
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GeorgeClark - 13 Aug 2011